How to Calculate Paver Base
Learn how to estimate base material volume beneath a simple paved area.
Calculate the base volume
Multiply the paved length by width to get area. Multiply that area by the planned base thickness in metres. The result is cubic metres of base material before allowance.
Example
A 5 m × 4 m area is 20 m². At 10 cm thickness, the base volume is 2.0 m³. With 10% allowance, the planning quantity is 2.2 m³.
Related tool
Use the Paver Base Calculator →
Choose a realistic base depth
The right base depth depends on the soil, expected loads, drainage and the paving system. A light garden path and a driveway should not automatically use the same specification. Follow the paving manufacturer's instructions and local guidance; the example below is only a volume calculation, not a design recommendation.
Worked example with unit conversion
Suppose a rectangular patio is 5 m long and 4 m wide. Its area is 5 × 4 = 20 m². If a project specification calls for a 100 mm base layer, convert 100 mm to 0.10 m. The compacted geometric volume is 20 × 0.10 = 2.0 m³. If you allow 10% for handling and variation, the planning amount becomes 2.2 m³. Confirm whether a supplier quotes loose or compacted volume, because those quantities are not always interchangeable.
Before ordering
- Measure the actual paved footprint and split L-shaped areas into rectangles.
- Convert every depth to metres before multiplying.
- Account for excavation, existing ground levels and any specified sub-base layers separately.
- Check drainage falls and edge restraint requirements before work starts.
Common estimating mistakes
Using millimetres as if they were metres makes the result 1,000 times too large. Another common mistake is treating base material, bedding sand and jointing sand as one layer. Estimate each material from its own specified depth and coverage. For irregular areas, calculate smaller sections and add them together rather than applying one average dimension to the entire site.
Use the Paver Base Calculator for a quick volume estimate and the Paver Calculator for the paving units themselves.